Superior Lighting Q&AAnswer
Oct 07, 2025 - 07:45 PM
MR16 describes the shape and size of the bulb (a multifaceted reflector that is 2 inches in diameter), while GU5.3 refers to the base type, which has two pins spaced 5.3 millimeters apart. Most MR16 bulbs use a GU5.3 base, which makes them compatible in many low-voltage fixtures, especially in track lighting, landscape lighting, and recessed spotlights. However, not all MR16 bulbs have the same base, some use GU10 or other connectors, so always check your fixture’s voltage, socket type, and transformer compatibility before installing a replacement to ensure safe and proper operation.
